Electric clock.



N0. 7l6,996. Pfented Dec. 30, |902.

M. FISCHER.

ELECTRIC CLOCK.

Application led Sept. 3, 1901;)

(No Model.)

UNITED STATES PATENT OEEICE.

MARTIN FISCHER, OF ZURICH, SWITZERLAND, ASSIG-NOR TO ACTIENGESELL-SCHAFT MAGNETA ELECTRISCHE UHREN OHNE BATTERIE it OHNE CON- TACTE, OFZURICH, SWITZERLAND, A FIRM.

ELECTRIC CLOCK.

SPECIFICATION forming part f Letters Patent No. 716,996, dated December30, 1902.

Application iiled September 3, 1901. Serial No. 74,163. (No model.)

'o @ZZ whom, it may concern:

Be it known that I, MARTIN FISCHER, a citizen of the Republic ofSwitzerland, residing at Zurich, Switzerland, have invented new anduseful Improvements in or Relating to Armatures for Electric Clocks, ofwhich the following is a specication. y

This invention has reference to improvements in armatures forreversible-current ro subordinate clocks. According thereto the armatureis constructed with a bent portion that is arranged with and quite closeto the surface of a permanent magnet without being in contact therewithand is made comparatively large in area, so that a large surface isprovided thereby, enabling smaller electromagnets to be used.

An example of apparatus according to this invention is shown in theaccompanying 2o drawings, in Which- Figure 1 is an elevation,and Fig. 2is a plan.

3 is an armature constructed with a bent portion that is arrangedparallel to a permanent magnet 4. The armature 3 is attached to a tube6, which is placed on a pin 7, Secured to the base-plate, so that thearmature can oscillate, as well known, in front of the poles of theelectromagnet M about the pin 7.'

3o On the bent portion of the armature there is provided in line withits aXis of rotation a short pin 8, which projects upwardly, so as toprevent the armature, which is powerfully attracted by the permanentmagnet 4, from coming into contact with the said permanent magnet. Thebent portion of the armature is made comparatively large in area, sothat a large and efficient surface is provided, thereby enabling verysmall electromagnets 4o to be used, while at the same time producing apowerful polarity of the armature.

It will be observed that one end of the permanent magnet 4 is bent atright angles, the bent portion 4 extending between the cores of theelectromagnets M on the rear face of the conductive plate m, in whichsaid cores are seated and to which said vertical portion 4 of thepermanent magnet 4 is secured by means of a screw, so that the otherpole of 5o the magnet 4 serves to polarize said cores.

`crank lever 11 12 with the said spring is located at a considerabledistance from the 6o stud 10, so that when the armature is moved by thecurrent passing through the electromagnetthe ends of the lever will makea considerable to and fro movement. The ends of the arms 11 and 12 ofthe bell-crank 65 lever are provided with pins 13 and 14, which when thebell-crank lever is moved about the Astud 10 come alternately intocontact with the teeth of a wheel 16, so as to move the said wheelforward each time by one tooth 7o and then hold it.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed,

I declare that what I claim is- 1. In a reversible current subordinateclock, the combination with the escapementwheel and its anchor; of anelectromagnet,v a right-angular permanent magnet having one of its polesextended beyond said elec- 8o tromagnet, a pivotallymounted armature forsaid electromagnet having a right-angular extension parallel with andproximate to the extended pole of the permanent magnet andY presentingsuch a large surface to the infiuence of the magnetic field as to admitof the use of a very small electromagnet, and a connection between thearmature and anchor adapted to oscillate the latter, substantially asset forth. 9o

2. In a reversible current subordinate clock, the combination with theescapementwheel and its anchor; of an electromagnet, a right-angularpermanent magnet havingone of its poles 4 arranged to polarize the elec-95 tromagnet-cores and its opposite pole 4 extended beyond said coresand between them,

a pivotally-niounted armature havinga rightangular extension parallelwith and proximate to the extended pole of the permanent roo magnet, anda resilient connection between said axis of rotation; of a permanentmagthe armature and anchor adapted to oscilnet arranged with one of itspoles parallel to late the latter, for the purpose set forth. thearmature extension and a spacing de- 15 3. Inreversible-currentsubordinateclocks, Vice between the two, for thepurpose set 5 the combination with an escapeinent-wheel forth.

and its anchor, an electromagnet and its ar- In testimony whereof I havesigned my mature provided with an extension, an arm name to thisspecification in the presence of on said armature, a spring on the arm,one two subscribing witnesses.

end of which spring is connected with said MARTIN FISCHER. ro arm at apoint close to the axis of rotation of Witnesses:

the anchor and having its opposite end con- A. LIEBERKNECHT,

nected to the anchor at a point distant from E. J. WESTERMANN.

